Duplex nailing-machine



(No Model.)

G A AMBLER DUPLEX NAILING MACHINE.

No. 525,066. Patented Aug. 28, 1894.

iz fr-*i onms PETERS a.: PNoTo-LlmoA. wAsmnoroN. u. c.

2 Sheets-Sheet 2.

(No Model.)

G'. A. AMBLER. DUPLEX NAILING MAGHINB.

Patented Aug. 28, 1894.

Norms PETERS co4; Momu'm UNITED @STATES ATi-NT t'frrch,.

GEORGE A. AMBLER, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE WIRE GRIP FASTENING COMPANY, OF CHICAGO, ILLINOIS.

DUPLEX N AIL-INGIFIVIACHINE.

SPECIFICATION forming part` of Letters Patent No. 525,066, dated August as, 1894.

Application filed December 4. 18,93.

serial No. 4232.724. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. AMBLER, of Newark, New Jersey, have invented certain Improvements in Duplex Nailing-Machines, of which the following is a specification.

This invention relates to the type of appliances for slugging the heels and taps and for uniting the soles and uppers of boots and shoes by means of fastenings composed of wire which is fed from a coil and forced into the stock to be united and is then cut o. Such appliances as heretofore constructed are adaptedto insert only one such fastening at each actuation. By the present improvement two such fastenings yare simultaneously in-` serted, either in a continuous row or in two parallel rows, acc'ording as the stock is presented and fed.

The accompanying drawings, illustrating the so-called working head of a slugging machine convertedA into a duplex nailing device by the incorporation into it of the present improvements, are as follows:-

Figure l is a central longitudinal section. Fig. 2 is a transverse section taken through the plane indicated by the dotted line won Fig. 1. Fig. 3 is a longitudinal section taken through the plane indicated by the dotted line y-y on Fig. 2. Fig. 4is an elevation of the spindle, showing the screw threaded sleeve for controlling the position of the gripping sleeve. Fig. 5 is alower end View. Fig. 6 is a longitudinal section of the lower portion of the head taken through the plane indicated by the line y-y on Fig. 2, showing the grippers released from compression by the gripping sleeve. Fig. 7 is an isometrical perspective of the tongue which is interposed between the throat pieces. Fig. 8 is an isometrical perspective of one of the double grippers. Fig. 9 is a transverse section taken through the plane indicated by the line z--Z on Fig. 3, illustrating the mode of operation of double grippers, each composed of separate pieces.

The drawingsrepresent the principal portion of the so-called working head of the machine heretofore used for slugging the heels and taps and for uniting the soles and uppers of boots and shoes. The parts of the structure represented in the drawings, which are old, are the hollow spindle, a; the longitudinally slotted spindle extension a; the throat pieces, b b', contained within the spindle; the gripping sleeve, c, which is commonly called the slug grip ring;7 the threaded sleeve, d, commonly called the slug thread ring, the sleeve, e, commonly called the tappet ring, the gripper carriers, f, f, and the upper spring l vgrippers, g, for preventing any upward move- 6o ment of the wire during the return or upward movement of the grip ring. Each of the throat pieces is provided with the central longitudinal groove, b2. These two grooves have heretofore been employed as the guides for a single wire during the actuation of the device.

The present invention relates to the embodiment in the structure shown in the drawings of the features by which that structure is converted into a duplex nailing or fasten- V7o ing device, the said new features being as follows, viz: First, the tongue, A, which is interposed between the throat pieces, b b', and which is provided upon its opposite sides with the central longitudinal grooves, A and A2, 7 5 to enable it to serve in conjunction with corresponding grooves, 52 b2, in the throat pieces to suitably guide the two separate wires h and h', While they are being forced out of the spindle extension into the work. The lower 8o end of the tongue, A, is thickened sufliciently to enable it to fill the space between the lower ends of the throat pieces b b. The shank, AS, of the tongue is of less thickness and is chamfered on the opposite sides of itscentral lon- S 5 gitudinal portion. The throat pieces, b b', as heretofore constructed,have had their grooves shallow enough to leave portions of the wire upon its opposite sides exposed sufficiently to permit the employment of a pair of wire grip- 9o pers, one on one side and the other on the other side of the wire, for the purpose of gripping the wire and forcing it forward into the work. These grippers have heretofore been commonly called slug grippers, and have been composed of a steel blade having a serrated edge'for engaging the wire, the said blade being formed integrally with a thicker back, adapted to make a sliding fit with the opposite side walls of either of the longitudiroo nal slots, a2, in the spindle extension; the back of the grippers being longer than the serrated blade and being provided with an inwardly projecting tongue adapting it for engagement with the instrumentality by which the grippers are moved longitudinally.

The second feature of the present invention consists in the employment of a double gripper, B, in place of each single gripper heretofore employed. The double gripper may consist of two parallel serrated blades, B B2, integral with the thick back, B3, the extension, B4 of which is provided with the usual tongue, B, adapted to be seated in the usual cavities, f f', formed in the exterors of the gripper carriers, f, f. The double gripper, however, instead of being formed of one piece, may be composed of two single grippers, C C', placed side by side, as indicated in Fig. 9. a slight advantage in making the double grip` per in two parts, by reason of the fact that if one set of grippers encounters a section of wire which is of slightly less than its normal thickness, while the other set is encountering a section of wire of full thickness, the eect of the compression of the hollow conical surface, c', of the slug grip ring, c, upon the inclined ends, B6 of that pair of the grippers engaging the thicker wire will be to force those grippers sidewise and thus drive the other pair of grippers engaging the smaller wire laterally against the conical surface c', with the necessarily resultant eect that the other pai r of grippers will thereby be forced farther inward and made to firmly engage the section of wire which is of less than its normal thickness.

It will be perceived that the presence of two separate pairs of guiding grooves permits the device t0 be employed for simultaneously fas- There is v tening wires diering from each other in size or in the shapes of their cross sections, as, for example, one wire may be circular in cross section, while the other has in cross section the shape of a parallelogram.

What is claimed as the invention isl. In a working head for a duplex nailing machine the combination as herein described of the spindle, spindle extension, two longitudinally grooved throat pieces and gripping and actuating devices, with a tongue interposed between said throat pieces and having upon its sides longitudinal grooves corresponding with the grooves in said throat pieces, as and for the purpose set forth.

2. In theworking head of a duplex nailing machine the slug grip ring, tappet ring, spin die, spindle extension, two throat pieces provided with longitudinal grooves, a tongue interposed between said throat pieces and also provided with longitudinal grooves, in cornbination with double grippers for gripping two wires seated in said grooves and at each actuation of said working head simultaneously forcing said wires into the stock to be united.

3. In a duplex nailing machine the combination of the throat pieces b and b', each provided with a longitudinal groove, b2, with the tongue A, provided npon its opposite sides with the longitudinal grooves A A2, as and for the purpose set forth.

GEO. A. AMBLER.

Witnesses:

A. M. JONES, E. GATTERER. 

